úÎ „    9non-portable (FlexibleInstances, DeriveDataTypeable, CPP) provisionalmasahiro.sakai@gmail.comNone Signs of real numbers.  positive zero  negative Unary negation. Absolute value. Multiplication. Reciprocal fraction. Fractional division. Fractional division. Sign of a number. Mnemonic symbol of a number. This function returns "-", "0", "+" respectively for , , .            ! sign-0.2.0 Data.SignSignPosZeroNegnegateabsmultrecipdivpowsignOfsymbol $fAbelianSet $fAdditiveSet $fDivisionSet $fUnitalSet$fCommutativeSet$fMultiplicativeSet$fFractionalSet$fNumSet$fBoundedLatticeSet$fBoundedMeetSemiLatticeSet $fLatticeSet$fMeetSemiLatticeSet$fDivisionSign $fUnitalSign$fCommutativeSign$fMultiplicativeSign$fEnumerableSign$fHashableSign $fNFDataSign